Collet-chuck-operating means



Jan'. 1, 1924 EQL.. PFUNDER COLLET CHUCK' OPERATING MEANS 2 Sheets-Sheet 1 Filed Feb. 12. 1925 JaQ1,1924 l 1,479,314

' E. L. PFUNDER COLLET CHUCK OPERATING MEANS 'Filed Feb. 12. 192s 2 sheets-sheet 2` Patented Jan. l, 1924.

i 1,479,311: UNITED STATES par eNrg-.

EMIL L. rruNnnn, orwiNDsoR, CONNECTICUT, `"ASsIGfNOR vTo lTHE.;,r.1rt,=` NEY comi;v

:PANY, or HARTFORD, CONNECTICUT, A- CoaPoBATIoNoFCONNECTICUT. I

c:OLLET'-CHUoir-orianaTINGiirEANs..l

Application iledY February`125l19r23. *Serialliloqlit 1, l.

To all wlw/m, it may cof/wem."

Be it known-that I, EMIL L. PrUNDER, a

citizen of the United States, residing atV Windsor, in the county of Hartford and State of Connecticut, have invented anew and useful Improvementv in Collet-Chuck-Y Operating Means, Vof which the following isy a specification.

This invention relates to means for oper- Aating chucks of the collet type, that is,

chucks in which the holding jaws are formed from hardened spring metal and which open and close but slightly, interchangeable collets of various capacities for stock of different sizes and ,character being provided for one body, and which chucks are more especially designed for attachment to the arbor or spindle of a lathe, milling machine, screw machine or the vlike machine tool.

The object of the invention is to provide means which may be manipulated while the machine is running for powerfully closing the collet jaws upon or quickly opening the collet jaws from stock, regardless of variations in the size of the stock, within the maximiun range of the collet.

This object isattained by arranging on a chuck body of this class reciprocatory means which when set in one position and reciprocated will ratchet a collet operating collar rotarily in one direction and cause the jaws to contract, and when set in another position and reciprocated will ratchet the collet operating collar rotarily in the opposite direction so as to permit the jaws to eXpand,.the handles for setting and reciprocating the parts being associated so that the operations maybe performed with one hand and practically coincidently.

In the accompanying drawings Figure 1V shows a plan of a chuck and operating mechanism which embodies the invention. Fig. 2 shows on larger scale a view of the front end of the chuck. Fig. 3.shows a top view of the chuck with portions cut away on the line 3-3 on Fig. 2 Fig. 4 shows a longitudinal section of a portion of the chuck on the line 4 4 on Fig. 2. Fig. 5 is a section on line 5 on Fig. 2. Y

The chuck illustrated is of the generalV character of that described in United States Patent No. 1,398,341 issued November 29, 1921. In` this chuck there is a body 1 having a central opening that at the lrear contains vathreaded: bushing 2 for the attachmerit 'of the arbor: or spindle-.off

the kmachine withrwhich'itjis to befused. At, j

the frontthe opening and in this section is located the collet whichV has holding jaws 3 thebacks 4`of which alie;

inclined to fit thetapering Ywall of the-'loperieV VVVThe jaws are connected by spring Shanks 5 withjajoining band (i` in-a` common' way. TheY frontends of thelcolletvf jaws extend beyond the front end ofthe and are adapted to be engagedby` the ing in .the body.

body A flange 7 of the, cap 8 thatis keyed so as to slide longitudinally but4 notrotate on ,the

end ofthe body. `The-cap has an. exterior` thread and engaging this thread. is athread in a collar 9 which is keyed by balls l0 so that it may rotate onA butl not move longitudinally on the end of the body. Y tion of thecollar inonedirectiom as a result of the intermeshing threads, draws thecap in and causes-,the colletjaws to contract, while the rotationl of thevcollarinthe `oppofv site direction carriesjthe cap out andpermitsl the collet jawsfto expand. In ytheexterior of the collar are'recessesll withwalls 12 and 13 which are oblique with relation tol each other and to the axis of the chuck. Slidably mounted onthe body is asleeve 14. At the rear thisgvsleevehas an annular groove 15 in which; is fittedfa roll lmounted, on a lever 17. The lever at onerendis pivf.

in the body is'taperin'gi oted to a non-rotating b racket18 vmounted on anti-friction bearings. 149 on` the body, and at the other end has ahandle 2Q. -By swinging this lever back. and .forth ,the sleeve 14 may be reciprocated longitudinally,

on the body.V Atthe frontend yofthissleeve and ratchet the collar rotarily Ainioneldirection when the operating lever isswung back and' forth. `When the yokes areswungso as to carry the rolls 24 radially-inward, these `rolls are inlposit-ion to engagetheinclined walls 13,0n thel-Othrrg'side.- offthe recesses in the collaigfandjasthe sleeve and rolls are reciprocated, ratchetthecollar ,rof' tarly in the 4.other dreet-ioafln .theftorm shown there. aregfour sets ,offyokes` and rolls oni the yoperati"ng sleeve and threel recesses in the periphery of the oollar so that thefrolls; .engage :the .inclined .walls sucssvely.- ensl-.rotielli.atr the. Same time, that is, on one reciprocation one roll will act and on the subsequent reciprocations theollowing rolls will act in sequence. This transforms the recipreating 'movementsof the @seating sleeve te Ster .by Step ,rotary movements of lthe eol'lar which ldrawsin and pushes oiit 'the f 'cap that" `ciitrls V"the 'y ted1ftds1ide=n-the -epeiating sleeve butl rotate therewith is` a" selecting sleeve 25. In; radial slots'infthis sleeve are tumblers f 2'6fw'hi`ch have onftlieir vinner edges wedges j When theselectiiig sleeve 25isindved or wardfoneNof-each'setgof tumblers 26 are moved?'forwardQoverthe yokes and their wedgesosfcillate Athe yokes' and press down the `rollsl '24 onl one end; andwhen the sel lectingmsleevewis. moved backward the other of eaehhset'of ltumblersy 26 are.l drawn back over v the yokes andv 5 their wedges oscillate the yokes'jand press down the Irolls 23 on thevother'end. Whentherolls 2l'are pressed downl they are in position to engage the incliedlwalls 513' oftheicoll'ar 9as the sleeve 14 Y-is :re'cipnic'ated,' and when the vrolls 23 aredown theyare adapted `to f engage the iclined'walls 12 oitheicollar. When'the rolls are 'pressed'downv only'fone 'at a time isfin positiotd engage 'an' inclined lwall on the collar fas the sleeves are'. reciprocated, the othersf that are" pressed down' either Vride idly through'thegroo'ves or pass yieldingly over theperiphery of the collar. In 'an annulargrloove intheperipheryfnear'the rear end of theisele'ictiiig sleeve is a roll 29 yon the endof'fa lever 30'that'is pivoted tothe operating lever. This selecting lever has two handles 3l and B2 adjacent to the handl@Y (of the @operating lever.

Vl/Vhenthe selecting lever is swung to one position with relation tothe operating 'lever and the' operating 'lever is oscillated the rollsV on the yokes are in such position that .they'engagethe inclined walls on'one side ofY the 'recesses in -the vcollar andtu'rn the collar in such direction that'it draws in the cap and causes the 'collet jaws to contract 'intherecessesin the body. When the selecting lever is swung to the other position ythe lopposite inclined'walls loff-fthe recesses thefcollar and turn thecollarl in a direction which carries the cap out and allows thelcollet'jaws to spring open.

The oscillation of the operating lever Vthroughthe'oontactioithe rolls with the inclined walls, ratchets the collar for closing the chuck when the-selecting leve-r is in oneV p'osition,'fand 'for openingt'he chuck when the selecting lever is AinY thev other position.

Tliereis of course a'VV neutral position for the 'selecting"lever7 and when in this position moving"the-operatinglever effects no result; t:'oth the operating leverand-'selecting lever are grasped by the same hand, and the selecting lever'manipulated `to'cause the necessary -rollstoI move' into functioning position ,and the operating lever then oscill'ated for ratcheting the collar by practically a singley mover'n'ent".` With vthis mechanism a powerful closing landa quick opening 'of thel jaws ymay be accomplished without in-V terfering with the running of the machiney to which the chuckis applied',`thus much time is saved particularly when a large number of piecesy of substantially the same sizleiaitofbe held bythech'uck.v j

The invention claimed 'is ze y Y lrThe combination with a chuck ofthe character described-of longitudinally movable'ineans adapted to 'controlthe position of the collet, rotatable'means-i'or positioning said collet controlling'nieans, and reciprocating means adapt'ed'to imparta step by step'rotative movement tol said rotatable means. l 1

Thecombination with a chuck of the character described 4oii'longitudinally movable"means adapted 'to control the position ofthe collet, rotatable means for positioning said collet controllingfmeans, and adjustable reciprocating 'means' adapted-to impartv a rotative movement tosaid rotatable means in either' direction, saidjreciprocating means when in 'one adjustment being `capable ol;v imparting rotative movement to said rotatable means in 'one direction, and when in another adjustment being capable of imparting rotative Vmovement to said rotatable means in the-oppositefdirection The combination with a chuckk'ol the Y character described of longitudinally 1novableV means 'adapted to control thev position of the collet, rotatable means for'position'ing said collet controlling means, reciprocating means adapted to impart step by step vrotativemovementsf to sai'd'rotatable means,' -and selective .means :carried 'by said reciprocating means adapted to v`determine the direction of "themovements v imparted toy said rotatable means by said'reciprocatingmeans.

4; The combination with" aV 'chuck' :of4v -.the

character described of longitudinallymovable means adapted to control the position of the collet, rotatable means for positioning said collet controlling means, an operating sleeve mounted on the chuck body, means for reciprocating said sleeve, and means carried by said sleeve and adapted to engage said rotatable means and impart rotative movements thereto.

5. The combination With a chuck of the character described of longitudinallyv movable means adapted to control the position of the collet, rotatable means for positioning said collet controlling means, an operating sleeve mounted on the chuck body, means for reciprocating the operating sleeve, and adjustable means carried by saidcsleeve and adapted to engage said rotatable means and impart rotative movements thereto in opposite directions according to its adjustment.

6. The combination With a chuck of the character described of longitudinally movable means adapted to control the position of the collet, rotatable means for positioning said collet controlling means, an operating sleeve mounted on the chuck body, means for reciprocating the operating sleeve, means carried by the operating sleeve and adapted to engage said rotatable means and impart rotative movements thereto, a selecting sleeve mounted on the operating sleeve, and means on the selecting sleeve for determining 'the action of the means carried by the operating sleeve on said rotatable means.

7. The combination With a chuck of the character described of longitudinally movable means adapted to control the position of the collet, rotatable means for positioning said collet controlling means, an operating sleeve movable longitudinally on the chuck body, a selecting sleeve movable longitudinally on the operating sleeve, means for reciprocating the operating sleeve, means for reciprocating the selecting sleeve, adjustable means carried by the operating sleeve for engaging and imparting rotative movements to said rotatable means, and means carried bythe selecting sleeve for adjusting said engaging means carried by the operating sleeve and determining the direction of rotative movement imparted to the rotatable means.

8. The combination with a chuck of the character described of a cap adapted to control the position of the collet, a collar having a threaded engagement With the cap and adapted to position the cap, said collar having grooves with Walls oblique to the axis ot the chuck, an operating sleeve, a lever for reciprocating the operating sleeve, oscillatory yokes carried by the operating sleeve, rolls mounted on the yokes and adapted to engage the oblique Walls of the grooves in the collar, a selecting sleeve, means for reciprocating the selecting sleeve, and tumblers carried by the selecting sleeve and adapted to engage and oscillate the yokesfaccording to the position of the selecting sleeve.

9. The combination With a chuck of the character described ot a cap adapted to control the position of the collet, a collar having a threaded engagement With the cap and adapted to lposition the cap, said collar having Walls oblique to the axis of the chuck, an operating sleeve, a lever for reciprocating the operating sleeve, transversely rocking yokes carried by the operating sleeve, rolls mounted on the ends of the yokes and adapted to engage said oblique Walls, means for reciprocating the selecting sleeve,l Wedging tumblers carried by the selecting sleeve and adapted to engage the yokes, and Vsprings for causing the tumblers to rock the yokes.

10. -The combination With a chuck of the character described of a cap adapted to control tlie position of the collet, a collar having a threaded engagement With the cap and adapted toposition the cap, said collar having Walls oblique to the axis of the chuck, an operating sleeve, an operating handle for reciprocating the operating sleeve, transversely rocking yokes carried by the operating sleeve, rolls mounted on the yokes and adapted to engage said oblique Walls, a selecting sleeve, a selecting handle pivoted on the operating handle for reciprocating the selecting sleeve, and means carried by the selecting sleeve and adapted to engage the yokes and rock them according to the position of the selecting sleeve.

l1. VThe combination With a chuck of the character described of a longitudinally movable cap adapted to control the positionof the collet, a rotatable collar threaded on said cap, an operating sleeve movable longitudinally on the chuck body, a selecting sleeve movable longitudinally on the operating sleeve, a lever for reciprocating the operating'sleeve, a lever for reciprocating the selecting sleeve, adjustable means carried by the operating sleeve for engaging and im- 1 parting rotative movements to said collar in either direction, and means carried by the selecting sleeve for adjusting said adjustable means carried by the operating sleeve and determining the direction of rotative movement imparted to the collar.

l2. The combination With a chuck of the character described of rotatable means for positioning the collet, reciprocating means adapted to impart a step by step rotative movement to said rotatable means in either direction, and an operating lever and a selecting lever for adjusting and operating said reciprocating means.

EMIL L. PFUNDER. 

